Abstract: In a method of booting an electronic system, a processor generates a booting request signal in response to an external control signal, and a memory controller enables the processor to read and execute a first boot program stored in a first memory in response to the booting request signal. The processor generates a booting success signal when booting using the first boot program is successful. The memory controller enables the processor to change, from reading and executing the first boot program stored in the first memory to reading and executing a second boot program stored in a second memory for booting of the electronic system, according to at least one of the booting request signal and the booting success signal.